Hi Lachlan,
I’ll assume everythign is plugged in and powered on etc.
Maybe one approach would be to try a different 12V power supply, and different USB cables in case they are broken somehow.
Failing that I would have to say the most likely application is a fault in the hardware/assembly which is somehow preventing it from communicating with the reactor. I don’t think moisture is the issue (as you said) since usually if that is the case it wouldn’t reach the “start up complete” message without error.
Unless you want to get in the device and start soldering connections etc probably the best approach is to reach out to labmaker and ask if they can replace/fix it.